It receives formatted messages and routes messages to one or more users. IT can deliver messages to users on local/remote machines. It will be started by tcpip sub-system . It uses /etc/mail/sendmail.cf as config file.

15. After a successful login, the login command displays the message of the day, the date and time of the last successful and unsuccessful login attempts for this user, and the total number of unsuccessful login attempts for this user since the last change of authentication information (usually a password).

How do you suppress these messages?

You can suppress these messages by creating a “.hushlogin” file in your home directory.

For Example,

At the prompt in your home directory, type the following:# touch .hushlogin

The touch command creates the empty file named .hushlogin if it does not already exist. The next time you log in, all login messages will be suppressed. You can instruct the system to retain only the message of the day, while suppressing other login messages.

17. How to override variables defined in /etc/environment for a particular user?

A fourth file that the operating system uses at login time is the$HOME/.env file, if your .profile contains the following line:

export ENV=$HOME/.env

The .env file lets you customize your individual working environment variables. The .env file contains the individual user environment variables that override the variables set in the /etc/environment file. You can customize your environment variables as desired by modifying your .env file.

Usage of nohup doesn't kill the process if you close the telnet session. Output from the process/script will be stored in a file called nohup.out in the directory from where you started the process.

This will help you in case if you want to start backup using mksysb and close your terminal/ leaving office, you can safely use "nohup command &". Next day morning, you can view the contents of nohup.out to know the status of the backup job.

The current message is always prefixed with a greater-than symbol (>).

Each one-line entry displays the following fields:

status - Indicates the class of the message.number - Identifies the piece of mail to the mail program.sender - Identifies the address of the person who sent the mail.date - Specifies the date the message was received.size - Defines the number of lines and characters contained in themessage (this includes the header).subject - Identifies the subject of the message, if it has one.

The status can be any of the following:N - A new message.P - A message that will be preserved in